I've made that promise, totally thinking it was true, and I've also had it said to me.
But, alas, I am alone now.
I read in a book recently that men should never make grand-scale, absolute statements as promises, because they simply can't know whether they'll be able to keep those promises, even with the best of present intentions, and often the result will be hurt feelings.
The book was on dating and courtship -- or, rather, dating versus courtship. It recommends clear, spelled-out, mutual-communicated steps in courting. It said some very interesting things, some of which have changed my perspective considerably.
For instance, it said that many dating couples have a fundamental confusion about where they are in their relationship at any given time. So, sweeping promises get made way early, because the time feels right to verbally commit to those things, and because they can see no clear evidence that they shouldn't make such promises. Indeed, they're so romantic, and sound so altruistic, don't they? Sometimes even to their giver.
The book ("Boy Meets Girl", by Joshua Harris) also stresses that couples should not put the physical stage of their relationship ahead of the emotional and relational stages, because that causes confusion, and often heartbreak, when the shock comes that you weren't where you thought you were in your relationship. So, the book emphasizes the need to keep the emotional, physical, practical, spiritual, and commitment aspects of your relationship coordinated together. For example, don't let the emotional aspect leap ahead of the practical. I'm a VERY emotional person -- so much so that I'm often completely blinded by the surge of my feelings, especially in relationships. I find it virtually impossible to coordinate my practical relationship aspects with my emotional aspects. Therefore, I tend to want to instinctively take flying leaps in the form of incredible verbal statements, statements which are straight from my heart, but which over-reach my grasp to actually fulfill and guarantee in the future.
And speaking of guarantees, there are none. Try to remember that infinite security is not on the menu. So, to get the next-best kind, always plan carefully.
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Christianity is different than Judaism only in people's minds -- not in the Bible.